JPS59160733A - Method and device for testing water leakage in piping system - Google Patents

Abstract

PURPOSE:To enable early discovery of a defective point before completion by fluctuating the pressure in a test piping by the combination of pressurizing means and a stop valve so that the fatigue in the potential defective part is accelerated. CONSTITUTION:A storage tank 1, a pressurizing pump 2 and a test piping 3 are connected respectively to each other by means of pipings 4, 5. When the pressure in the piping 3 is increased by driving the pump 2 and opening or closing a stop valve 8 by operating a open/shut driving mechanism 9, the pressure in the piping 3 is decreased sharply by the opening of the valve 8. The pressure increases again when the valve is closed. The discharging rate of water is adjusted by a valve 10, and the period for opening and closing the valve is adjusted by the mechanism 9, by which the pressure is set at the fluctuating width which is most suitable for the test sample. If the pressure in the test piping is fluctuated in such a way, a dynamic pressure is continuously exerted on the joint part which is a potential defective part, by which the fatigue is accelerated and leakage of water is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method and apparatus for testing water leakage in piping systems.
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Conventionally, water leakage tests for piping systems in buildings have been carried out by pouring static water specie onto the piping system, leaving it for at least one hour, and then checking to see if the water pressure inside the pipes has dropped. However, even if this test method is judged to be satisfactory, water leakage may occur at joints such as joints between pipes, connections between pipes and other equipment, and joints between equipment within one year after completion. This may occur. The reasons why water leakage accidents occur in such a short period of time are generally considered to be due to the following reasons. In other words, the conventional testing method involves applying hydrostatic pressure, so-called pressure is released, so even joints that have the potential for water leakage do not experience fatigue, and therefore do not cause water leakage. On the other hand, in actual use, the water pressure in the piping fluctuates repeatedly and dynamic pressure is applied, so the joint becomes fatigued, and the accumulated fatigue leads to water leakage.

Therefore, the present invention makes it possible to discover potential defects by applying dynamic pressure that simulates actual use to accelerate initial fatigue.

Therefore, the present invention provides a water test method for <%:i water on threads that can detect such potential defects, and an apparatus that can be used directly to carry out the method. That is,
The method of the present invention connects a pressurizing means to the test pipe to increase the pressure inside the pipe, and at the same time opens and closes the U11 closing valve at a predetermined period to reduce the pressure inside the test pipe by opening the valve. The device of the present invention has a pressurizing means that is connected to the test pipe to increase the pressure inside the pipe, and an outlet side of the pressurizing means that is branched. , a branch road configured to condense water into a water storage tank;
The gist is that the on-off valve provided in this branch path and the on-off drive 1 follower that alternately opens and closes the on-off valve at a predetermined period are incorporated.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the diagram, ■ is a water storage tank, 2 is a pump as an example of pressurizing means, and 3 is a test pipe. The water storage tank 1 and the Caro pressure pump 2 and the pressurizing pump 2 and the test pipe 3 are connected by pipes 4.5, respectively. 6 is a connecting portion between the pipe 5 and the sample pipe 3. Reference numeral 7 denotes a branch path which branches off the outlet side of the Calo pressure pump 2 to supply water to the water storage tank lvc, and a solenoid valve, for example, is provided as an on-off valve 8 in this branch path. This electromagnetic valve 8 is controlled by an opening/closing drive mechanism 9 to open and close the valve at predetermined intervals.

The opening/closing drive mechanism 9 includes, for example, a timer 1'1 for setting a valve opening time, a timer 'r2 for setting a valve closing time, and a counter C for displaying the number of times the valve is opened or closed in il-numbers. In the figure, 10 is a valve that adjusts the amount of water discharged when the on-off valve 8 is open, and 11 is a safety valve.

In this configuration, the pressurizing pump 2 is driven to
When the on-off drive mechanism 9 is operated to open and close the on-off valve 8, the pressure inside the test pipe 3 decreases rapidly as the on-off valve 8 opens, and then closes. rise again. In this case, the range of pressure fluctuation in the test pipe is determined by the water capacity in the pipe, the amount of water discharged in the branch 7, and the opening/closing cycle of the on-off valve 8. Therefore, the displacement amount is adjusted by the valve 10, and the opening/closing drive mechanism 9 is operated to 1 tr.
By adjusting the four closing cycles, it is possible to set the required pressure width most suitable for the pipe under test, with a maximum pressure of 10' and a minimum pressure of 51. /;g2 Figure shows the opening/closing cycle of the on-off valve 8 and the vibration of the pressure inside the test pipe during the jt+J period.

If the pressure inside the test pipe is varied as described above, dynamic pressure will be continuously applied to the joint part due to a potential defective cross section, which will accelerate fatigue and cause water leakage. Become.

Therefore, one defective part can be discovered in a short time before construction is completed.

In the above i-embodiment, a solenoid valve is used as the on-off valve 8, but a ball valve may also be used instead. In that case, a variable motor may be connected to the valve and used as the opening/closing drive mechanism. Further, although the pressurizing pump 1 has been illustrated as an example of pressurizing means, the reli can be changed to a pressurizing water tank or the like that can be kept at 1 pressure at all times.In the present invention, these pressurizing pumps or Water tanks and the like are referred to as soil means. Furthermore, when carrying out the method of the present invention, the opening iW'i valve 8 is not provided in the branch path 7;
For example, it may be provided in the test pipe 11JII. This is because even in this case, the pressure inside the test pipe can be varied by opening and closing the on-off valve.

As explained above, according to the present invention, the pressure inside the test piping is varied by the combination of the pressurizing means and the on-off valve, and fatigue of the potentially defective parts is accelerated. This has the effect of making it possible to detect water leaks and to focus on early water leakage accidents that occur within a year after construction is completed. In the i, Hlvp; y pipelines tested in the experiment, compared to the conventional testing method using hydrostatic pressure, the ratio of uncovered construction defects increased from 45.5 inches to 82.9%, about twice as much. however,
In this experiment, the number of pulsations was approximately 1000 times.

[Brief explanation of drawings]

FIG. 1 is a diagram of a piping configuration showing an embodiment of the present invention, and FIG. 2 is a diagram showing the opening/closing cycle of an on-off valve and the state of pressure fluctuation in the test piping. ■... Water storage tank, 2... Pressurizing means (pressurizing pump)
, 3... Test piping, 7... Branch path, 8... Opening/closing valve, 9... Opening/closing drive mechanism.

Claims (2)

[Claims] (1) Connect a pressurizing means to the sample distribution to increase the pressure in the pipe, and reduce the pressure in the pipe by opening and closing the on-off valve at a predetermined period to reduce the pressure in the test pipe by opening the valve. The calyx is characterized by a pulsating structure.
Water leak test method for U yarn. (2) A pressurizing means that is connected to the test pipe to increase the pressure inside the pipe, a branch path that branches off the outlet side of the pressurizing means and condenses into a water storage tank, and this branch. A water leakage test device for a distribution/u system comprising an open/close valve installed in the roadway and an opening/closing drive mechanism that alternately opens and closes the open/close valve at a predetermined period.